Response Modification Factor of RC Frames Strengthened with RC Haunches

Table 2

Seismic performance of as-built RC frame in various seismic zones.

Zone	Ca	CV	Cs, demand (R = 3.0)	Cs, capacity	FoS	Remarks
1	0.08	0.08	0.06	0.20	3.45	OK
2A	0.15	0.15	0.11		1.84	OK
2B	0.2	0.2	0.14		1.38	OK
3	0.3	0.3	0.22		0.92	N.G.
4	0.4	0.4	0.29		0.69	N.G.